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Application of laser ultrasound imaging technology in the frequency domain based on Wigner–Ville algorithm for detecting defect

Lookup NU author(s): Professor Gui Yun TianORCiD

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Abstract

According to the thermoelastic and heat conduction equations of laser ultrasonic, ultrasonic propagation images are obtained by solving finite element solution equations. Based on thermoelastic mechanism, a Wigner–Ville transform ultrasonic propagation imaging method of stronger frequency selectivity was proposed. An aluminum plate with defects was scanned by a pulsed laser, the ultrasonic waves produced by a pulsed laser were received by an ultrasonic sensor, and then ultrasonic propagation imaging on the aluminum plate was analyzed in detail. In order to isolate a damage-related ultrasonic wave, a Wigner–Ville algorithm as a frequency selectivity method was proposed to convert a complex time domain multiple wavefield into a simple frequency domain single wavefield. At last, we compared the conventional ultrasonic propagation imaging method with the Wigner–Ville transform ultrasonic propagation imaging method, which demonstrated that the Wigner–Ville transform ultrasonic propagation imaging method can effectively and intuitively evaluate the sizes of damages or flaws without any reference data, which should promote the application of the technique in the industry.

Publication metadata

Author(s): Zeng W, Wang HT, Tian GY, Hu GX

Publication type: Article

Publication status: Published

Journal: Optics & Laser Technology

Year: 2015

Volume: 74

Pages: 72-78

Print publication date: 11/11/2015

Online publication date: 09/06/2015

Acceptance date: 22/05/2015

ISSN (print): 0030-3992

ISSN (electronic): 1879-2545

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.optlastec.2015.05.015

DOI: 10.1016/j.optlastec.2015.05.015

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